19 Nov
2006
19 Nov
'06
9:43 p.m.
From: Jos Dreesen / Marian Capel <jos.mar at
bluewin.ch>
Gordon JC Pearce wrote:
Hi
Even if you replace the trace, it may still not work. The trace
most likely blew because a transistor shorted. Unless they put a
few extra transistors on the die, it would be hopeless. Most
current uP's have extra gates and flops but these are intended
for last minute mask changes that always seem to happen.
Dwight
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Chris M wrote:
It is possible to repair this, it is just not economical.
What you need is a focused ion beam machine.
Most of bigger IC design centers have them.
IIRC somewhere around 600USD/hour operating costs, probably higher by now.
Jos Dreesen
--- Brent Hilpert <hilpert at cs.ubc.ca>
wrote:
Nah. Tony Duell, on the other hand...
Gordon
(...cracked the bad 4201 open and actually
managed
to find the fault under a
microscope - a blown trace in a metalization layer
... not that I can do
anything about it.)
No chance at all? lol